Update README.md

Author: Traviskn

README.md

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 A project committed to making file access and data transfer easier and more efficient for React Native developers.
 
+# ⚠️ Unmaintained ⚠️ 
+
 # Version Compatibility Warning
 
 rn-fetch-blob version 0.10.16 is only compatible with react native 0.60 and up. It should have been a major version bump, we apologize for the mistake. If you are not yet upgraded to react native 0.60 or above, you should remain on rn-fetch-blob version 0.10.15